16results about How to "Improve anti-coking performance" patented technology

The invention provides a utilization method of an affiliated product resin in a decommissioned carbon fiber reinforced resin-based composite material and a prepared anticorrosive coating, the method comprises the following steps: mixing the decommissioned carbon fiber reinforced resin-based composite material with a fused salt containing CeO2 in a fused salt tank, heating and preserving heat, separating out carbon fibers, and collecting a liquid-phase product; rectifying the liquid-phase product, and separating a water phase and a phenol-rich phase; adding epichlorohydrin into the phenol-rich phase, and hardening and tempering; and finally, adding epoxy resin and a solvent into the quenched and tempered phenol-rich phase to obtain the metal anti-corrosion paint. And coating the metal surface with the obtained metal anti-corrosion paint, and curing to obtain an anti-corrosion layer. Compared with the prior art, the Ce-based catalyst provided by the invention can effectively improve the reaction rate, reduce the yield of coke and improve the yield of a liquid phase product, and has good anti-coking property. The phenol-rich oil is prepared by cracking and then is used as a metal anticorrosive coating.

The invention belongs to the technical field of catalyst preparation, and particularly relates to a dehydrogenation catalyst which takes nickel aluminate spinel as a carrier and transition metal phosphide Ni2P as an active component, and the mass of the active component accounts for 5-20% of the total mass of the Ni2P / NiAl2O4 catalyst. The invention also provides a preparation method of the dehydrogenation catalyst, which comprises the following steps: preparing nickel aluminate spinel by adopting a coprecipitation method, then loading nickel salt and phosphorus salt onto the carrier, and drying, roasting and reducing to obtain the loaded Ni2P / NiAl2O4 catalyst. Compared with the prior art, the non-noble metal dehydrogenation catalyst prepared by the method is low in price, the preparation method is simple and easy to implement, and the non-noble metal dehydrogenation catalyst shows good reaction performance in a reaction for preparing benzofuran-2 (3H)-ketone through catalytic dehydrogenation and has potential industrial application prospects.

The invention belongs to the technical field of catalysts and application thereof, and particularly relates to a preparation method and application of a framework nickel-doped TS-1 type molecular sieve catalyst. According to the method, TS-1 titanium silicalite molecular sieve raw powder prepared from cheap raw materials is adopted as an initial raw material, nickel cations are introduced into a TS-1 molecular sieve framework in a mode of combining nickel ion coordination complexation with tetrapropylammonium hydroxide hydrothermal treatment, and a hollow cavity is formed in a molecular sieve crystal. The protective effect of the complexing agent on nickel ions effectively prevents the nickel ions from forming metal nickel particles in the hydrothermal treatment process; the tetrapropylammonium hydroxide promotes the TS-1 titanium silicalite molecular sieve to be dissolved and recrystallized to form closed or open mesopores, and nickel ions are embedded into a molecular sieve framework. In the prepared nickel-doped TS-1 titanium silicalite molecular sieve, nickel exists in the form of positive ions and partially replaces titanium ions in a framework, so that the charge density around the titanium ions is remarkably reduced, and the surface acidity is weakened.

The invention discloses a method and device for preparing synthesis gas through high-temperature electrolysis, and the method comprises the following steps: raw material gas enters an electrolytic tank from an anode inlet, and anode tail gas directly enters a cathode of the electrolytic tank and finally leaves the electrolytic tank from a cathode outlet; the raw material gas comprises hydrocarbon fuel, water vapor and / or carbon dioxide, and the hydrocarbon fuel comprises methane, ethane, propane, methanol, ethanol and / or biomass gasified gas; the water vapor and / or carbon dioxide in the raw material gas are / is subjected to an electrolytic reduction reaction at the cathode to generate hydrogen and / or carbon monoxide, and the hydrocarbon fuel in the raw material gas is subjected to a partial oxidation reaction at the anode to generate hydrogen and carbon monoxide. The device has the advantages that the gas inlet and outlet path design and gas inlet component management of the device for preparing the synthesis gas through electrolysis of the hydrocarbon fuel assisted solid oxide are simplified, the carbon deposition resistance of the anode is enhanced, and the stability and the reliability of operation of the device are improved.

The invention discloses a carbon nanotube catalyst for hydroquinone fixed bed hydrogenation reaction and a preparation method thereof. The method comprises the following steps: 1, crushing carbon nanotubes, uniformly dispersing the crushed carbon nanotubes in an ethanol aqueous solution, carrying out ultrasonic treatment, adding a nitric acid solution, continuously carrying out ultrasonic treatment, filtering, washing the obtained solid to be neutral, heating and drying; step 2, mixing the solid obtained in the step 1 with gamma-Al2O3, performing extrusion molding, and loading an active component; step 3, reducing the catalyst obtained in the step 2 before use; and 4, carrying out hydroquinone fixed bed hydrogenation reaction by using the catalyst obtained in the step 3. The invention also provides the carbon nanotube catalyst for the hydroquinone fixed bed hydrogenation reaction prepared by the method. The catalyst and the preparation method thereof provided by the invention have important significance in improving the strength of the catalyst, prolonging the service time of the catalyst, improving the production efficiency and reducing the cost.

The invention discloses a method for preparing a gallium-doped hollow ZSM-5 molecular sieve through microwaves and application of the gallium-doped hollow ZSM-5 molecular sieve, and relates to the technical field of molecular sieve catalyst preparation. The preparation method comprises the following steps: mixing a silicon source, a template agent and deionized water, stirring to prepare a precursor, transferring the precursor into a digestion tank, carrying out microwave hydrothermal treatment, and roasting in a muffle furnace to remove the template agent to obtain a pure silicon molecular sieve; the method comprises the following steps: taking a pure silicon molecular sieve, adding an aluminum source, a template agent and deionized water, carrying out ultrasonic treatment, transferring into a digestion tank, carrying out microwave hydrothermal and dissolution-recrystallization, and roasting the obtained product in a muffle furnace to remove the template agent so as to obtain a hollow ZSM-5 molecular sieve; the method comprises the following steps: taking a hollow ZSM-5 molecular sieve, adding gallium nitrate and deionized water, carrying out ultrasonic treatment, transferring into a digestion tank, and carrying out gallium doping under microwave irradiation; and putting the dried product into a tubular furnace, and carrying out heat preservation in an argon atmosphere at 200-300 DEG C to obtain the gallium-doped hollow ZSM-5 molecular sieve. The microwave hydrothermal process and the dissolution-recrystallization process are combined, so that the preparation time of the hollow ZSM-5 molecular sieve is effectively shortened, and the energy consumption is reduced.

The invention discloses an Al2O3-Cr2O3-ZnO / OH--H beta metal solid acid catalyst as well as a preparation method and application thereof, the catalyst comprises an OH--H beta molecular sieve carrier obtained by alkali treatment of an H beta molecular sieve, and Al2O3, Cr2O3 and ZnO are loaded on the OH--H beta molecular sieve carrier; wherein Al2O3 accounts for 1-10 wt% of the mass of the catalyst carrier, and Cr2O3 and ZnO respectively account for 1-15 wt% of the mass of the catalyst carrier. The preparation method comprises the following steps: carrying out roasting treatment, alkali treatment and ion exchange on an H [beta] molecular sieve to prepare an OH <->-H [beta] molecular sieve carrier with hierarchical pores, placing the carrier in a mixed aqueous solution composed of an aluminum salt, a chromium salt and a zinc salt with the same volume for equivalent-volume impregnation, and carrying out standing, drying and roasting to prepare the catalyst. The catalyst not only retains the characteristic of high stability of traditional micropores, but also has relatively high anti-coking performance, and has the advantages of high conversion rate, high selectivity, high yield and long service life for synthesis of ethyl acetate.

This invention discloses a composite catalyst with high resistance to coking in methane dry gas reforming. The composite catalyst is composed of three components: a supported nickel-based catalyst, a nitrogen-doped carbon-supported molybdenum catalyst, and an inert support. The invention also discloses its application in methane dry gas reforming. After hydrogen reduction, the composite catalyst exhibits excellent activity and stability under high space velocity reaction conditions in methane dry gas reforming, overcoming the deficiency of Ni-based catalysts in methane dry gas reforming that are prone to coking and deactivation under high-temperature conditions.

The invention is suitable for the technical field of boiler anti-coking, and provides a hearth anti-coking focus-shaped sound source sound field optimization system and a method thereof.The hearth anti-coking focus-shaped sound source sound field optimization system comprises a coking state estimation module, a focus-shaped sound source sound field optimization module and a focus-shaped sound source sound field optimization module, constructing a coking state estimation model according to the reference coking thickness distribution, the hearth inner wall surface heat flux and the historical soot blower action frequency, and outputting a coking state index; and the coking trend prediction module is used for constructing a coking trend prediction model according to the coking state index, the alkali metal content in the fuel and the fly ash concentration in the flue gas, and outputting a coking trend index. The system effectively solves the problems of single control strategy, lack of comprehensive evaluation and insufficient sound field optimization in the traditional hearth anti-coking technology through comprehensive perception of the hearth coking state, trend prediction, sound source health monitoring and dynamic optimization regulation and control of the sound source power.

The present invention discloses a heavy and residual oil hydrodemetallization catalyst and a preparation method thereof. The catalyst comprises a catalyst inner layer composed of a first alumina layer and a second alumina layer carrying a first active component and a catalyst outer layer composed of a third alumina layer carrying a second active component; the mass ratio of the first active component in terms of oxide to the mass ratio of the second active component in terms of oxide is 1.15 to 1.75, and the ratio of the content of tetrahedral molybdenum to that of octahedral molybdenum in the catalyst in terms of Mo atoms is 0.16 to 0.32. When the catalyst provided by the present invention is used for the hydrodemetallization reaction of heavy and residual oil, it has strong anti-carbon deposition performance, high demetallization activity and metal tolerance, and can ensure the long-term operation of the device.

The utility model provides an anti-coking device for a settler, which belongs to the technical field of settler plates and comprises an overflow hopper arranged at the lower part of a coarse spinning dipleg and positioned at the inner bottom of the settler; an upper overflow opening is formed in the top end of the overflow hopper, a lower overflow opening is formed in the bottom end of the overflow hopper, and the lower portion of the rough spinning leg extends into the overflow hopper through the upper overflow opening; a superheated steam fluidization ring pipe is arranged at the inner bottom of the overflow hopper, and a nozzle is arranged on the superheated steam fluidization ring pipe; the superheated steam fluidization loop pipe is connected with a steam pipeline, one end of the steam pipeline is connected with the superheated steam fluidization loop pipe, and the other end of the steam pipeline penetrates through the overflow hopper and then is connected with a fluidization steam inlet formed in the upper portion of the settler. Through the measures of reasonable structural design, accurate flow control, wear resistance, condensation prevention and the like, oil gas entrainment can be effectively reduced, catalyst accumulation and coking are prevented, the separation efficiency is improved, the structural strength is high, maintenance is convenient and fast, and the operation cost is reduced.

The invention relates to the technical field of petrochemical engineering, and discloses a treatment method for improving the anti-coking capacity of an alloy and application of the treatment method. According to the method provided by the invention, the anti-coking performance of the alloy surface is greatly improved through the cooperation of laser shock treatment and oxidation vulcanization treatment. In addition, the hydrocarbon cracking furnace tube prepared from the alloy treated by the method disclosed by the invention can still keep good anti-coking property after multi-cycle continuous operation.

The application discloses a preparation method of an oil slurry selective hydrogenation catalyst, and comprises the following steps: (1) preparing a molybdenum-cobalt impregnation solution with a volume greater than the pore volume of a catalyst carrier; (2) adding the catalyst carrier into a rotary vacuum impregnation dryer, spraying the molybdenum-cobalt impregnation solution onto the catalyst carrier under the conditions of rotation and vacuum, and then performing vacuumizing, rotary drying, and calcination to obtain the oil slurry selective hydrogenation catalyst. The oil slurry selective hydrogenation catalyst prepared by the method has both desulfurization activity and low three-ring and four-ring aromatic hydrocarbon saturation performance, and is suitable for a selective hydrogenation desulfurization reaction of catalytic oil slurry.

The invention discloses a cerium-zirconium composite oxide modified nickel-based catalyst and application of the cerium-zirconium composite oxide modified nickel-based catalyst in pressurized CH4-CO2 reforming for synthesis gas preparation. The general formula of the catalyst is xNi-yCe < 0.5 > Zr < 0.5 > O < 2 >-SiO2, in the formula, the value of x is 8%-15%, and the value of y is 2.5%-20%; the preparation method comprises the following steps: dissolving nickel salt, cerium salt and zirconium salt in deionized water, adding into silica sol, adding beta-cyclodextrin, drying, roasting and the like. According to the catalyst disclosed by the invention, the active metal Ni and the formed cerium-zirconium composite oxide are uniformly dispersed in the carrier SiO2, the cerium-zirconium composite oxide remarkably inhibits sintering of metal Ni particles, more oxygen holes can be formed to accelerate elimination of carbon deposit, and the carbon deposit resistance is improved. The raw materials used in the preparation method are cheap, the preparation conditions are easy to control, and the method is simple. The catalyst is used for pressurized CH4-CO2 reforming synthesis gas preparation reaction, the highest methane conversion rate can reach about 59% (750 DEG C, 0.5 MPa) and is close to the thermodynamic equilibrium conversion rate under the reaction condition, and the methane conversion rate is basically kept unchanged after operation for 42 h.

The application discloses a supported catalyst, a preparation method and a catalytic reforming method. The supported catalyst comprises a Sn-containing alumina carrier and an active component. The active component comprises Pt. The Pt is dispersed on the Sn-containing alumina carrier in the form of sub-nanometer clusters. The method for preparing the supported catalyst comprises the following steps: (1) adding a Pt precursor into a reducing organic solvent to obtain a first solution; (2) adjusting the pH value of the first solution to 8-14 to obtain a second solution; (3) adding the Sn-containing alumina carrier into the second solution to perform impregnation, drying and calcination, and obtaining an intermediate product; and (4) performing water-chlorine activation and reduction on the intermediate product obtained in the step (3). In the supported catalyst for catalytic reforming reaction, the Pt is dispersed on the Sn-containing alumina carrier in the form of sub-nanometer clusters. The catalyst has better catalytic selectivity and anti-carbon deposition capacity for a naphtha catalytic reforming reaction, and can obviously improve the yield of liquid products.